Izici:1. Umzimba ongaphezulu womuntu omdala wenziwe ngezinto ezikhethekile, futhi isakhiwo sangaphakathi sokwakheka komzimba sihlukile;2. Uhlelo olujikelezayo olusobala: umthambo we-cephalic, umthambo we-basilic, umthambo we-jugular, umthambo we-subclavian, i-precava kanye ne-hear; yonke inqubo ye-catheter engena kwi-precava ingabonakala.